Erasing machine



- .EEE 4H35 A TS-Z 7 April23,1946. Q c. B. FISHER 2,398,823

ERA'S ING MACHINE Filed May 15, 1944 /a' X2, 20' ,f6-4- 55 1 P fi-*WC rl/llllllllllllllllllllll INVENToR. CHARLES 55h/ER Patented Apr. 23, 1946 Charles B. Fisher,A Ellyn,l l. applicati@ May V15, 1944i, serial'nsfssassla 19 claims. (orizosell f This invention relates to new and useful im? provements in erasing devices, andparticularly to apower driven eraser. p t Y y y 'I'he usual type of erasing machine found in' the larger drafting rooms and ofces geneallyfcon'- sists of a small universal type electric motor have ing mounted on a shaft extension thereof` a smallY cylindrical erasing tip held conveniently "in"` a' simple chuck or by some otherV means. In"`op' eration, the motor is energized andthe rubber tip is held lightly against the surface to be erased.

Holding the tip lightly against the surface to be' erased .isa procedure requiring considerable Adex-4 terity and is often tedious, withjthejresultant temptation on the part Aof the operator tof bea'r heavily against the surface to hasten the process and to simplify the taskf These practices of the operator tend to placean undueV amount of Wear` on the surface to be erasec`l,andA on'expensive tracings tend to cause burns with consequent discoloration of the tracing. a v t i i' Another disadvantage of the machines ofthe prior art has been the necessity' for frequently changing the erasing tip as wear takes place.` The loss of time and the trouble involved'in sup plying new erasing tips for the machine arefiob-f' vious drawbacks attendant upon'devicesofthe prior art. v Another disadvantage of the devices of the prior art has beenthat the erased material tends'V to obscure the material to `be erased, andthe jopie' erator is therefore required to remove theferased' material in order to seehow the operationis progressing. j The invention here accordingly makesuse of an eraser in the shape of a cylindrical 'tubej formed of rubber or other erasing material which isheld in a hollow shaft or by other means, in a power driven device, in such a fashion that a considerable length of erasing material may be of the invention includes an arrangementwhere-fA by the' end of the hollow erasing tube may be stretched radially and held in the hollow shaft to the end that a high peripheral speed of the pA" further. object of the` invention'is to provide.V

Worl ;".v i

A istill furtherrobjectjis topprovide a hollow cyf4 an'erasing machine with a hollow 'shaft portion adapted to retain and; secure a hollow erasing member,V said shaftr being 'flared at its end, said erasing member:beingv stretched radially in con-` formity` with saidflared end, and extending beyndvthe end ofjsaid fiaredshaft portion,l whereby a high peripheralspeed of the erasing machine is,`

achieved,to theyend that the erasing may be done more quickly and with less heating of eraser `and lindlieagl erasrigmeiberlhaving a plurality of longitudinal' slitsitherein. to the end,that in the erasingmachineidescribed in the foregoing object,

thatwthe 'tip .0f the erasing member forms a plu- Y40 used before a new eraser isrequired. A feature L* g scrbdntrn's--of pre-.rred'embodiments therej tip is attained whereby the erased material is 'w easily removed from proximity to the'workgby virtue of the turbulence inthe air therearound: Other salient features are set out below as objects of the invention.

It is an object ofthe invention to provide an f Y member adapted foruse in the erasing machine improved erasing member for an erasing machine which can be conveniently and easily held within the shaft of said machine, yet permitting quick and easy adjustment, so that the erasing member can be used with a maximum of elllciency."

ralilty` of radially extending small erasing projections for creating impact 'against the surface to be erased, I iigh peripheral speed; and disturbance of the air therearound, whereby the speed of theerasure` is increasedand erased material is rapidly removed with less heating and consequent wear of the eraser and damage to the work.

A yet further objepctof'V the invention is to pro# videfa simple andj efficient arrangement for pro-` jectirigthe wlornl erasingn member beyond the'end ofthe `memberwhereingitjis retained, so that the machine may loe adjusted `with aminimum of delayand inconvenience to the operator.

' Anotherobject of the'invention is to provide in an'erasing maehineanarrangement for securing janerasingmember therein `at the same time causing V'turbulencetothe air surrounding the Verasing tip duringpperation so' that the erased `mattiria-1 isrernolved readily from proximity to tlie"`jvvork-inforder that the work to be done is not' obscured from theoperator. y

.Other desirable objects of the invention will be readily understood VVfrom `a study` of` the descrip-` tion'hereinaft'er;r however, the invention is detionaleview of r an erasing machine according to the presentinventionp4 Figure .2 is` an isometric view of an erasing ofFigurelyf i, a. A

-Figurel3 'is an end view of anerasing machine as 'shown'inigure '1, "but using as anerasing if? membrtlie embodimentshownin Figure 2;

Figure 4 is a section taken on the lines 4-4 of Figure 3;

Figure 5 is a sectional View of another embodiment of the invention;

Figure .8 is laviewtaken in the directiofn`ofiftliel arrows 8 8 of Figure 7.

Referring now to Figure 1, there is shown an CTI erasing machine, indicated generally by theV ordinal I0, comprising a motor housinggportion f I2 having a rotating shaft I4 extending there-l from and including a hollow portion lllwh'icii bells or flares as at I8. The housing,portionI2 v shown in Figures 7 and 8, there is provided the may enclose any suitable motor device, as for example, a pneumatic, vacuum or electric'm'ot'or; i

but for purposes -here ,thefmotor may beassumed to be of the universalLtype driven .by either al-l ternating or direct current. p

Within the hollowsl'raft' portionflis retained a hollow cylindrical erasing member .20 .which is capable vof being stretched as, a't22 to t the. contoursof flared portion la of thebhollow shaft .I6 andto extend radially `Vtherebe'yond'as at .24 yto provide a-n'erasing surface. For'maintaining the erasing member in position and in iirm-engage-- ment' with shaftmembe'r I6 va tapered spreader bolt v26 is provided, fathreaded endv28 of which is heldin the shaft I4. irorvnrmiy'wedgingthe eraserl member 2liV against the'f.i1are'dportionQIIlk of the hollow 'shaft-,IIL theboltfZhasla .similarly flared head 38. Aslot .32 is provided in the head 30 forengagement by a'sivtabletool sov that the bolt 26 may be threaded ntothesh'aft vrmand the entire assembly held firmly-together.

vanes for creating agitation of the air while the machine is in use, and making possible assembly of the device without the need of a tool. As shown in Figure 5, the hollow shaft I6 carries Within it a hollow erasing member 42 which is flared only slightly at its end, as at 44, and secured in the hollow shaft I6 by a retaining screw 46 flared slightly at 48 to distort the erasing member 42,Y The end of theretaining screw has a series of radial vanes zfvvhich give agitation to the'air surrounding as the eraser member 42 is 1 operated.

Referring now to Figures 7 and 8, there is shown fan; embodiment of the invention here where there shaft I 4 having a hollow portion I6 which flares out .at I8, AThe hollow erasing member 20 is held inthe hollow shaft andthe tapered spreader bolt 26 holds the eraser in position intheV hollow shaft I6 and vagainst the flared portion I 8 being threadablyen'ga'ged with the shaft I4 as at 28.

I For facilitating .the adjustment of the erasing member ..20 as wear takes place a collar'52 surrounding "the spreaderbolt 26 and havinga plurality of radially extending ears 54 is provided. Theearsi54 extend through a slot 56 in hollow shaft I6 as shown more clearly in;Figure.8. The collar 52 may be lightly biased against Athe inner end of the erasing member'ZD' by means of alight coiledspring 58.'abutting the solid shaft I4 and surroundingthe spreader bolt 26.

Referring now to Figure's2, 3, and 4, another I 6. As shown inFigure 3,1e`a'oh'of .theelements 38 extendsradially beyond the flared portion.A 1,8

to forma plralityfof small .eraser elements ,4.0.

From theforeg'oing descriptionitwill be .appar-A ent by"nieansof the e'mbodimentl described .in

Figu'ref there is provided an erasin'gjdevicegcapable of giving'hi-gh linear or peripheral speeds'to' the erasing element whereby only've'ry'nominal' pressures are required'again'stthe surface tobe' erased, at the same time giving enough'agitation to the surrounding air to remove erased material and to keep the rerasedsurface cool. Inthe embodiment shownAv in Figures 2, -3, and 4,'lthere is provided an erasing device capable of givinghigh linear or peripheralspeeds to theverasing-element, at the same time providingaconsiderable amount of agitation 'to fthe surrounding `air -to remove the erasedmaterialwand tokeep .the :work cool. `By means of theplurality of projecting small erasing elements afcertainamountofrimzpact and digging action isgivenLtomthe'surface to be erased,r therebyffacilitating the erasing...

Referringnow to .Figure 5, ,there fislshown .an embodiment of an erasing machine using 'aztubular `erasing member where theend of Vthermomretaining screwiis provided l:with -.a plurality cof '"As wearof 'the erasing member 20 takes place andit is'de'siredto movejthe memberfZ .outwardly vand radially', the 'tapered spreader bolt is first loosened, thecollar I52 is moved outwardly at theears '54 by the operator, andthe spreader bolt drawn up once more with a new portion of the erasing member 20 presented foruse.

While the invention has been described in terms of Ypreferred embodiments, it is not intendedlto be limitedin terms of the embodiments shownQnor'jotherwise thanby the scope of the claims appended.

. l. An erasing machine comprising a shaft, a tubular .erasing member held thereon, and means passing through said tubular erasing member for sefcuring'said erasing member to said shaft. Y

v2. An .erasing machine comprising a shaft,

Y means comprising a tube for forming an erasing member, and means passing through said first means for securing said first means'to said shaft.v

3.l Amotor driven eraser including'incombination: a vhollow rotatable shaft,v a "flared portion Aon the end of saidshaft, anda tubular erasing nation; a shaft, a flared portion at the-endof s aidshaft, and a tubular erasing-member supported .byr4 said A, shaft and `bearing against said fla-redfportion; M

s `A6.:;r\.-motor driven -geraser comprising in .Combination-:5. a shaft, aV ared portion .-at lthe end of said shaftxza tubular .eraser supportedfby :said

shaft, said eraser being adapted to be deformed to match the contour of said flared portion.

7. An erasing machine comprising a motor, a shaft driven by said motor, a ared portion at the end of said shaft, an eraser being adapted to be deformed radially to match the contour of said flared portion, and means for securing said eraser to said shaft.

8. An erasing machine comprising a motor, a hollow shaft driven thereby, a tubular erasing member supported Within said shaft, a member for holding said erasing member within said shaft, and means for moving the erasing member outwardly to adjust for the wear thereof.

9. An erasing machine comprising a motor, a hollow shaft driven by said motor, a tubular erasing member having a plurality of longitudinal slits therein supported within said hollow shaft, and a member for holding said erasing member within said shaft.

10. An erasing machine comprising a motor, a shaft driven by said motor, a tubular erasing member, means for securing the erasing member to said shaft, and means for moving the eraser member outwardly to adjust for the wear of said erasing member.

1l. An erasing machine comprising a motor, a shaft driven by said motor, a tubular erasing member, means for securing the erasing member to said shaft and for flaring the end of said erasing member, and means for moving the erasing member outwardly to adjust for the wear thereof.

12. A motor driven eraser including in combination: a hollow rotatable shaft, a flared portion on the end of said shaft, and a tubular erasing member held within said hollow rotatable shaft and said flared portion, said erasing member being adapted to be deformed radially to match the contour of said ared portion.

13. An erasing machine comprising a motor, a hollow rotatable shaft driven by said motor, a flared portion on the end of said shaft, a tubular erasing member supported Within said hollow rotatable shaft and said ared portion, said erasing member being adapted to be deformed radially to match the contour of said flared portion, and a member for holding said erasing member firmly against said flared portion and within said hollow shaft.

14. An erasing machine comprising a hollow shaft, a hollow erasing member therein and protruding from the end of said shaft, and means for retaining said erasing member within the shaft, said first means including means for creating turbulence of air around the end of said erasing member.

15. An erasing machine comprising a motor,

i a hollow rotatable shaft driven by saidmotor,

a ared portion on the end of said shaft, a tubular erasing member having a plurality of longitudinal slits therein supported within said holloW rotatable shaft and said flared portion, and a member for holding the slitted portions of said erasing member against said flared portion.

16. An erasing machine comprising a motor, a hollow rotatable shaft driven by said motor, a flared portion on the end of said shaft, a tubular erasing member having a plurality of longitudinal slits therein supported within said hollow rotatable shaft and said flared portion, and a member for holding the slitted portions of said erasing member against said ared portion, and for holding the erasing member within said hollow shaft.

17. An erasing machine comprising aV motor, a hollow shaft driven thereby, a flared portion on the end of said hollow shaft, a tubular erasing member supported within said shaft and said ared portion, said erasing member being adapted to be deformed to match the contour of Y said flared portion, a member for holding said erasing member against said flared portion, and means for moving the erasing member outwardly to adjust for the wear thereof. 

